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4. Moisture content: <br /> a. At the time of batching, all aggregates shall be in a saturated <br /> surface-dry condition. <br /> b. In no event shall the free moisture content of the fine aggregate at <br /> the time of batching exceed eight percent of its saturated, <br /> surface-dry weight. The batch-to-batch uniformity of all aggregates <br /> shall be such that variations in moisture constant within one <br /> hour do not exceed twice this variation in a period of four hours. <br /> c. Install and maintain in operating condition an electrically <br /> actuated moisture meter which will indicate on a readily visible <br /> scale the percentage of moisture in the fine aggregate as it is <br /> batched,within a sensitivity of one-half of one percent by weight of <br /> the fine aggregate. <br /> 5. Use scales for proportioning of the springless dial type or the multiple beam <br /> type as follows: <br /> a. If scales are of the dial type, the dial shall be of such size and so <br /> arranged that it may be read easily from the operating platform. <br /> b. If of the multiple beam type, the scales shall be provided with an <br /> indicator operated by the main beam which will give positive visible <br /> evidence of over or under-weight. The indicator shall be so designed <br /> that it will operate during the addition of the last 200 pounds of any <br /> weighing. The overtravel of the indicator hand shall be at least <br /> one-third of the loading travel. Indicators shall be enclosed against <br /> moisture and dust. <br /> c. Accuracy of Scales. <br /> 1. Prior to beginning any work, all scales and other measuring <br /> devices used in batching shall be checked for accuracy by a <br /> County licensed scale technician. The scales shall be <br /> rechecked once every three months,or more often if deemed <br /> necessary. <br /> 2. A certificate of inspection, bearing the date of the certification <br /> and signed by the scale technician, shall be affixed to each <br /> measuring device. <br /> 6. Recorders: <br /> a. Provide an accurate recorder for producing a digital printout of <br /> the batch number and scale readings corresponding to each of the <br /> ingredients of each concrete batch, including zero initial readings. <br /> 08/12 0330511 11-4179 <br />